EP2891826B1 - Electromotive linear drive - Google Patents

Electromotive linear drive Download PDF

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Publication number
EP2891826B1
EP2891826B1 EP14194079.1A EP14194079A EP2891826B1 EP 2891826 B1 EP2891826 B1 EP 2891826B1 EP 14194079 A EP14194079 A EP 14194079A EP 2891826 B1 EP2891826 B1 EP 2891826B1
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EP
European Patent Office
Prior art keywords
coupling
linear drive
parts
auxiliary
load
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EP14194079.1A
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German (de)
French (fr)
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EP2891826A2 (en
EP2891826A3 (en
Inventor
Andreas Oberndörfer
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Dewertokin GmbH
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Dewertokin GmbH
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Publication of EP2891826A3 publication Critical patent/EP2891826A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D11/00—Clutches in which the members have interengaging parts
    • F16D11/14—Clutches in which the members have interengaging parts with clutching members movable only axially
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D11/00—Clutches in which the members have interengaging parts
    • F16D2011/008—Clutches in which the members have interengaging parts characterised by the form of the teeth forming the inter-engaging parts; Details of shape or structure of these teeth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2037—Actuator supports or means for fixing piston end, e.g. flanges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2071—Disconnecting drive source from the actuator, e.g. using clutches for release of drive connection during manual control

Definitions

  • the invention relates to an electromotive linear drive according to the preamble of claim 1.
  • the electromotive linear drive in question here is used in particular in connection with furniture, which are provided with movable components. These are in particular hospital and nursing beds, but also armchairs and similar furniture. Furthermore, such linear drives are also used for patient lifts.
  • Out DE 196 52 061 A1 is a dog clutch for transmitting a rotational movement from a drive shaft to an output shaft known with a plurality of first jaws at the end of the drive shaft and a plurality of second jaws at the end of the driven shaft and a positioning means for rotating one of the shafts to the rotated shaft in a To bring position in which the first claws with the second Claws are bump-free engageable with each other.
  • the invention has for its object to provide a releasable connection between the output member and connector part, which takes into account the design of a linear drive for beds and patient hoist.
  • the invention can be summarized in a simplified manner in that a double jaw clutch is provided, of which one acts as a load coupling and the torque, e.g. from the spindle nut transmits to the connecting part or the lifting tube, and the other, the alignment of the coupling parts of the load coupling causes such that they have the required alignment to each other before the final engagement without additional measures would be required.
  • the length of the cooperating recesses and projections of the auxiliary coupling in the direction of the closing movement may be greater than that of the projections and recesses of the load coupling, at least by the length of the closing path, which is required so that the coupling parts of the load coupling under all operating conditions before the beginning of Interlocking the same are aligned in a desired manner to each other.
  • the two coupling sections 10a and 10b are each provided with two coupling parts 14a, 16a and 14b, 16b, which are each mounted at a distance in the direction of the longitudinal axis of the coupling.
  • the two coupling parts 14a, 14b form a load coupling.
  • the two coupling parts 16a, 16b form an auxiliary clutch whose coupling parts come into engagement with each other when closing the clutch before the two coupling parts 14a, 14b of the load coupling with their projections 18 and recesses 20 for receiving a torque in Are engaged.
  • the positioning of the coupling parts 16a, 16b and the axial length of the projections 22 on the coupling portion 10a and the projections 24 on the coupling portion 10b and the respective recesses 26 and 28 are selected so that when merging the two coupling portions 10a, 10b in the axial direction Closing the clutch, the projections 22 and 24 with the recesses 26 and 28 of the opposite coupling portion engage rather than the coupling parts 14a, 14b of the load coupling is the case. In this way, an automatic alignment of the coupling parts to each other is achieved.
  • the drawing shows that the tooth-like projections 22 of the coupling part 16a on the coupling portion 10a are relatively narrow, ie provided with a small width in the circumferential direction and tapered at the free ends 30.
  • the latter also applies, albeit less pronounced, to the projections 24 of the coupling part 16b on the coupling section 10b.
  • the end faces 32 are chamfered, so that when merging the two coupling portions 10a, 10b when closing the clutch, the tip free ends 30 of the projections 22 when hitting the inclined surfaces 32 slide along this and so a torque in the circumferential direction of approximately in cross section circular coupling sections is created, which causes a relative rotation between the two coupling sections.
  • This relative rotation takes place as a function of the starting position of both coupling sections until the coupling parts 14a, 14b of the load coupling are aligned with each other such that with continued movement of both coupling sections in the closing direction, the projections 18 and recesses 20 of the two coupling parts 14a, 14b intermesh without that it initially to a placement of the projections on each other and then to a sudden displacement of the two coupling portions in the end position comes.
  • the projections 22 supporting wall of the coupling portion 16a is limited between these projections by edge portions 34 which upwards - based on the illustration in FIG. 2 - Are slightly cut out so that the projections 24 on the complementary coupling part 16 b can engage in the cut-off position of the coupling in these cutouts.
  • the protrusions 22 can be dimensioned thereby shorter.
  • FIG. 2 The drawing also shows that the recesses 28 are dimensioned at the coupling parts 16a, 16b substantially wider than the width of the tooth-like projections 22 on the coupling parts 16a, 16b, so that when the clutch is closed, a clearance between the projections 22 and the boundaries of the recesses 28 is provided in the circumferential direction of the coupling portions.
  • the clutch is provided in the opposite direction with a freewheel.
  • the play between the projections 22 and the associated recesses 28 of the coupling parts 16a, 16b allows a rotational movement in the freewheeling direction, even when the clutch is closed.
  • the coupling parts of the load coupling on the one hand and the On the other hand auxiliary coupling arranged along the longitudinal axis of the coupling in each case at a distance from each other.
  • the coupling parts 14a and 16a or 14b and 16b could be arranged overlapping each other.
  • the pointed free ends 30 of the projections 22 on the coupling part 16a in the open position of the coupling sections adjoin the base of the recess 20, possibly overlap or even overlap it. This is possible due to the different diameters of the load coupling and the auxiliary coupling.
  • the decisive factor is that the alignment of the two coupling sections caused by the auxiliary coupling is completed relative to one another before the mutually engaged coupling parts 14a, 14b of the load coupling prevent further rotational movement of the coupling sections 10a, 10b.
  • the coupling is arranged so that the coupling portion 10a is associated with the connecting part, for example a lifting tube, and the coupling part 10b with the driven member, or the spindle nut.
  • the assignment of the respective coupling part 10a, 10b on the spindle nut takes place immediately. This assignment can be cohesive. The latter embodiment can be seen as a preferred embodiment.
  • the coupling part 10a, 10b is an integral part of the spindle nut.
  • connection between the coupling portion 10a and the lifting tube or the like can take place via an external thread 40 on the coupling part 10a, which engages in a corresponding internal thread on the lifting tube, not shown.
  • the connecting part is designed as a lifting tube, it is also possible to attach at least one of the associated coupling portions 10a, 10b in one piece on the lifting tube.
  • a component is defined according to the present invention, which is adapted to transmit the movement of the spindle nut directly or indirectly to a component of a piece of furniture.
  • An immediate transfer takes place when the free end of the connecting part designed as a lifting tube is connected to a furniture component.
  • An indirect transfer takes place with the aid of further components, which are connected to the free end of the connecting part or with the free end of the lifting tube and formed for example as a clevis or the like, which is then connected to the furniture component.
  • the proposed between spindle nut and connector coupling according to the invention may be provided in addition to a coupling which is arranged between the preferably designed as a lifting tube connecting part and the adjustable part of a piece of furniture or patient lifter and, for example in DE 20 2011 000 964 U1 is described.
  • This coupling can also be designed as a dog clutch and be manually operated.
  • the drive side of this dog clutch is firmly connected to the connecting part or with the lifting tube, wherein the output side is connected to the furniture component.
  • this manually operable jaw clutch transmits forces both in the longitudinal direction, ie in the direction of the linear adjustment movement of the spindle nut, as well as in the circumferential direction.
  • the manually operable jaw clutch transmits no forces Circumferential direction.
  • the spindle nut When the lifting tube, the coupling part 10a, the coupling part 10b and the spindle nut are in rotationally fixed connection to each other, the spindle nut can be moved manually in the longitudinal direction of the spindle, so that in an emergency situation, for example, a load created in, for example, against gravity by manually turning the connection part or Lifting tube can be lowered.
  • the two coupling parts 10a and 10b of the coupling located between the spindle nut and the lifting tube are then disengaged, for example, when the support arm or extension arm of a patient lifter is generally inadvertently lying anywhere, thus interrupting the movement to be effected by the linear drive. Since closing the clutch, so the re-engagement of the coupling parts, takes place, automatically, as soon as normal operating conditions are available.

Description

Die Erfindung betrifft einen elektromotorischen Linearantrieb gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an electromotive linear drive according to the preamble of claim 1.

Aus DE 20 2011 000 964 U1 ist derartiger Linearantrieb bekannt, bei welchem eine Klauenkupplung am freien Ende des Hubrohres vorgesehen ist. Dabei ist für die Hubfunktion eine feste Verbindung der Spindelmutter mit dem Hubrohr vorhanden. Damit dieser bekannte Verstellantrieb Verstellkräfte nur in einer Bewegungsrichtung erzeugen kann, ist die Klauenkupplung mit einer Art vorgespanntem Freilauf ausgestattet.Out DE 20 2011 000 964 U1 Such linear drive is known in which a dog clutch is provided at the free end of the lifting tube. In this case, there is a fixed connection of the spindle nut with the lifting tube for the lifting function. In order for this known adjusting drive to be able to generate adjusting forces only in one direction of movement, the dog clutch is equipped with a type of preloaded freewheel.

Der hier in Rede stehende elektromotorische Linearantrieb wird insbesondere im Zusammenhang mit Möbeln verwende, welche mit bewegbaren Bauteilen versehen sind. Es handelt sich dabei insbesondere um Krankenhaus- und Pflegebetten, aber auch Sessel und ähnliche Möbeln. Ferner werden derartige Linearantriebe auch für Patientenlifter verwendet.The electromotive linear drive in question here is used in particular in connection with furniture, which are provided with movable components. These are in particular hospital and nursing beds, but also armchairs and similar furniture. Furthermore, such linear drives are also used for patient lifts.

Allgemein gilt für Klauenkupplungen, dass das Einkuppeln Probleme verursachen kann dadurch, dass beim Schließen der Vorsprung des einen Kupplungsabschnitts zunächst auf einem Vorsprung des anderen Kupplungsabschnittes sitzt. Dies kann eine schlagartige Verschiebung der Teile beim Einkuppeln zur Folge haben.Generally applies to jaw clutches that the engagement can cause problems in that when closing the projection of a coupling portion first sits on a projection of the other coupling portion. This can result in a sudden displacement of the parts during engagement.

Aus DE 196 52 061 A1 ist eine Klauenkupplung zur Übertragung einer Drehbewegung von einer Antriebswelle auf eine Abtriebswelle bekannt mit einer Vielzahl von ersten Klauen am Ende der Antriebswelle und einer Vielzahl von zweiten Klauen am Ende der angetriebenen Welle und einer Positioniereinrichtung zur Drehung einer der Wellen, um die gedrehte Welle in eine Position zu bringen, in der die ersten Klauen mit den zweiten Klauen stoßfrei miteinander in Eingriff bringbar sind.Out DE 196 52 061 A1 is a dog clutch for transmitting a rotational movement from a drive shaft to an output shaft known with a plurality of first jaws at the end of the drive shaft and a plurality of second jaws at the end of the driven shaft and a positioning means for rotating one of the shafts to the rotated shaft in a To bring position in which the first claws with the second Claws are bump-free engageable with each other.

Der Erfindung liegt die Aufgabe zugrunde, eine lösbare Verbindung zwischen Abtriebsglied und Anschlussteil zu schaffen, welche der Ausgestaltung eines Linearantriebes für Betten und Patientenlifter Rechnung trägt.The invention has for its object to provide a releasable connection between the output member and connector part, which takes into account the design of a linear drive for beds and patient hoist.

Diese Aufgabe wird durch die Lehre des Anspruchs 1 gelöst.This object is achieved by the teaching of claim 1.

Die Erfindung lässt sich vereinfachend dahingehend zusammenfassen, dass eine doppelte Klauenkupplung vorgesehen ist, von der die eine als Lastkupplung wirkt und das Drehmoment z.B. von der Spindelmutter auf das Anschlussteil bzw. das Hubrohr überträgt, und die andere das Ausrichten der Kupplungsteile der Lastkupplung bewirkt derart, dass diese vor dem finalen Einkuppeln die erforderliche Ausrichtung zueinander aufweisen, ohne dass dazu zusätzliche Maßnahmen erforderlich wären.The invention can be summarized in a simplified manner in that a double jaw clutch is provided, of which one acts as a load coupling and the torque, e.g. from the spindle nut transmits to the connecting part or the lifting tube, and the other, the alignment of the coupling parts of the load coupling causes such that they have the required alignment to each other before the final engagement without additional measures would be required.

Die Länge der zusammenwirkenden Ausnehmungen und Vorsprünge der Hilfskupplung in Richtung der Schließbewegung kann grösser sein als die der Vorsprünge und Ausnehmungen der Lastkupplung, und zwar mindestens um die Länge des Schließweges, die erforderlich ist, damit die Kupplungsteile der Lastkupplung unter allen betrieblichen Bedingungen vor Beginn des Ineinandergreifens derselben in gewünschter Weise zueinander ausgerichtet sind.The length of the cooperating recesses and projections of the auxiliary coupling in the direction of the closing movement may be greater than that of the projections and recesses of the load coupling, at least by the length of the closing path, which is required so that the coupling parts of the load coupling under all operating conditions before the beginning of Interlocking the same are aligned in a desired manner to each other.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen:

  • Figur 1 die Vorderansicht einer Kupplung gemäß der Erfindung in auseinandergezogener Position der beiden Kupplungsabschnitte,
  • Figur 2 eine Ansicht, teilweise im Schnitt in Richtung der Pfeile A-A der Figur 1.
In the drawing, an embodiment of the invention is shown. Show it:
  • FIG. 1 the front view of a coupling according to the invention in an exploded position of the two coupling sections,
  • FIG. 2 a view, partly in section in the direction of the arrows AA FIG. 1 ,

Die beiden Kupplungsabschnitte 10a und 10b sind jeweils mit zwei Kupplungsteilen 14a, 16a bzw. 14b, 16b versehen, die jeweils in einem Abstand in Richtung der Längsachse der Kupplung angebracht sind. Die beiden Kupplungsteile 14a, 14b bilden eine Lastkupplung. Die beiden Kupplungsteile 16a, 16b bilden eine Hilfskupplung, deren Kupplungsteile beim Schließen der Kupplung in Eingriff miteinander kommen, bevor die beiden Kupplungsteile 14a, 14b der Lastkupplung mit ihren Vorsprüngen 18 und Ausnehmungen 20 zur Aufnahme eines Drehmomentes in Eingriff sind. Demzufolge sind auch die Positionierung der Kupplungsteile 16a, 16b und die axiale Länge von deren Vorsprüngen 22 am Kupplungsabschnitt 10a und der Vorsprünge 24 am Kupplungsabschnitt 10b sowie der jeweiligen Ausnehmungen 26 und 28 so gewählt, dass beim Zusammenführen beider Kupplungsabschnitte 10a, 10b in axialer Richtung zum Schließen der Kupplung die Vorsprünge 22 und 24 mit den Ausnehmungen 26 und 28 des gegenüberliegenden Kupplungsabschnittes eher in Eingriff kommen als dies bei den Kupplungsteilen 14a, 14b der Lastkupplung der Fall ist. Auf diese Weise wird eine automatische Ausrichtung der Kupplungsteile zueinander erreicht.The two coupling sections 10a and 10b are each provided with two coupling parts 14a, 16a and 14b, 16b, which are each mounted at a distance in the direction of the longitudinal axis of the coupling. The two coupling parts 14a, 14b form a load coupling. The two coupling parts 16a, 16b form an auxiliary clutch whose coupling parts come into engagement with each other when closing the clutch before the two coupling parts 14a, 14b of the load coupling with their projections 18 and recesses 20 for receiving a torque in Are engaged. Accordingly, the positioning of the coupling parts 16a, 16b and the axial length of the projections 22 on the coupling portion 10a and the projections 24 on the coupling portion 10b and the respective recesses 26 and 28 are selected so that when merging the two coupling portions 10a, 10b in the axial direction Closing the clutch, the projections 22 and 24 with the recesses 26 and 28 of the opposite coupling portion engage rather than the coupling parts 14a, 14b of the load coupling is the case. In this way, an automatic alignment of the coupling parts to each other is achieved.

Die Zeichnung lässt erkennen, dass die zahnartigen Vorsprünge 22 des Kupplungsteils 16a am Kupplungsabschnitt 10a verhältnismäßig schmal, also mit einer geringen Breite in Umfangsrichtung versehen sind und an den freien Enden 30 spitz zulaufen. Letzteres gilt auch, wenngleich weniger stark ausgeprägt, für die Vorsprünge 24 des Kupplungsteiles 16b am Kupplungsabschnitt 10b. Auch hier sind die Stirnflächen 32 abgeschrägt, so dass beim Zusammenführen der beiden Kupplungsabschnitte 10a, 10b beim Schließen der Kupplung die spitzen freien Enden 30 der Vorsprünge 22 beim Auftreffen auf die Schrägflächen 32 an diesen entlang gleiten und so ein Drehmoment in Umfangsrichtung der im Querschnitt etwa kreisförmigen Kupplungsabschnitte entsteht, das eine relative Rotation zwischen beiden Kupplungsabschnitten bewirkt. Diese relative Rotation erfolgt in Abhängigkeit von der Ausgangsposition beider Kupplungsabschnitte solange, bis die Kupplungsteile 14a, 14b der Lastkupplung derart zueinander ausgerichtet sind, dass bei fortgesetzter Bewegung beider Kupplungsabschnitte in Schließrichtung die Vorsprünge 18 und Ausnehmungen 20 der beiden Kupplungsteile 14a, 14b ineinander eingreifen, ohne dass es zunächst zu einem Aufsetzen der Vorsprünge aufeinander und anschließend zu einer schlagartigen Verschiebung der beiden Kupplungsabschnitte in die Endstellung kommt.The drawing shows that the tooth-like projections 22 of the coupling part 16a on the coupling portion 10a are relatively narrow, ie provided with a small width in the circumferential direction and tapered at the free ends 30. The latter also applies, albeit less pronounced, to the projections 24 of the coupling part 16b on the coupling section 10b. Again, the end faces 32 are chamfered, so that when merging the two coupling portions 10a, 10b when closing the clutch, the tip free ends 30 of the projections 22 when hitting the inclined surfaces 32 slide along this and so a torque in the circumferential direction of approximately in cross section circular coupling sections is created, which causes a relative rotation between the two coupling sections. This relative rotation takes place as a function of the starting position of both coupling sections until the coupling parts 14a, 14b of the load coupling are aligned with each other such that with continued movement of both coupling sections in the closing direction, the projections 18 and recesses 20 of the two coupling parts 14a, 14b intermesh without that it initially to a placement of the projections on each other and then to a sudden displacement of the two coupling portions in the end position comes.

Die die Fortsätze 22 tragende Wandung des Kupplungsabschnittes 16a ist zwischen diesen Fortsätzen durch Randabschnitte 34 begrenzt, welche nach oben - bezogen auf die Darstellung in Figur 2 - etwas ausgeschnitten sind, so dass die Vorsprünge 24 am komplementären Kupplungsteil 16b in der Schließposition der Kupplung in diese Ausschnitte eingreifen können. Außerdem können dadurch die Vorsprünge 22 kürzer bemessen sein.The projections 22 supporting wall of the coupling portion 16a is limited between these projections by edge portions 34 which upwards - based on the illustration in FIG. 2 - Are slightly cut out so that the projections 24 on the complementary coupling part 16 b can engage in the cut-off position of the coupling in these cutouts. In addition, the protrusions 22 can be dimensioned thereby shorter.

Als zweckmäßig hat sich eine Ausgestaltung der Kupplungsabschnitte herausgestellt, bei welcher die beiden Kupplungsteile 16a, 16b der Hilfskupplung jeweils von einem Bauteil 36, bzw. 38 des Kupplungsabschnittes 10a bzw. 10b getragen sind, welcher einen kleineren Durchmesser aufweist als der das Kupplungsteil 14a bzw. 14b der Lastkupplung tragende Bauteil.As appropriate, an embodiment of the coupling sections has been found, in which the two coupling parts 16a, 16b of the auxiliary clutch are each supported by a member 36, and 38 of the coupling portion 10a and 10b, which has a smaller diameter than that of the coupling part 14a and 14b of the load coupling bearing component.

Figur 2 der Zeichnung lässt ferner erkennen, dass die Ausnehmungen 28 an den Kupplungsteilen 16a, 16b wesentlich breiter bemessen sind als die Breite der zahnartigen Vorsprünge 22 an den Kupplungsteilen 16a, 16b, so dass bei geschlossener Kupplung ein Spiel zwischen den Fortsätzen 22 und den Begrenzungen der Ausnehmungen 28 in Umfangsrichtung der Kupplungsabschnitte vorhanden ist. Dies trägt der Tatsache Rechnung, dass die Lastkupplung 14a, 14b so ausgebildet ist, dass sie ein Drehmoment nur in einer Richtung übertragen kann, wie sich aus der Form der Vorsprünge 18 und der Ausnehmungen 20 der Lastkupplung 14a, 14b ergibt. Somit ist die Kupplung in der entgegengesetzten Richtung mit einem Freilauf versehen. Das Spiel zwischen den Vorsprüngen 22 und den zugehörigen Ausnehmungen 28 der Kupplungsteile 16a, 16b ermöglicht eine Drehbewegung in Freilaufrichtung auch bei geschlossener Kupplung. FIG. 2 The drawing also shows that the recesses 28 are dimensioned at the coupling parts 16a, 16b substantially wider than the width of the tooth-like projections 22 on the coupling parts 16a, 16b, so that when the clutch is closed, a clearance between the projections 22 and the boundaries of the recesses 28 is provided in the circumferential direction of the coupling portions. This takes into account the fact that the load coupling 14a, 14b is designed so that it can transmit a torque in only one direction, as is apparent from the shape of the projections 18 and the recesses 20 of the load coupling 14a, 14b. Thus, the clutch is provided in the opposite direction with a freewheel. The play between the projections 22 and the associated recesses 28 of the coupling parts 16a, 16b allows a rotational movement in the freewheeling direction, even when the clutch is closed.

Bei dem in der Zeichnung dargestellten Ausführungsbeispiel sind die Kupplungsteile der Lastkupplung einerseits und der Hilfskupplung andererseits entlang der Längsachse der Kupplung jeweils in einem Abstand voneinander angeordnet. Es ist jedoch auch möglich, dass die Kupplungsteile 14a und 16a bzw. 14b und 16b in Längsrichtung aneinander angrenzen. Ferner könnte sie einander überlappend angeordnet sein. So können beispielsweise die spitzen freien Enden 30 der Vorsprünge 22 am Kupplungsteil 16a in der Offenstellung der Kupplungsabschnitte an den Fussgrund der Ausnehmung 20 angrenzen, gegebenenfalls diesen überdecken oder sogar überlappen. Dies ist aufgrund der unterschiedlichen Durchmesser der Lastkupplung und der Hilfskupplung möglich. Entscheidend ist, dass die durch die Hilfskupplung bewirkte Ausrichtung der beiden Kupplungsabschnitte zueinander abgeschlossen ist, bevor die miteinander in Eingriff befindlichen Kupplungsteile 14a, 14b der Lastkupplung eine weitere Rotationsbewegung der Kupplungsabschnitte 10a, 10b verhindern.In the embodiment shown in the drawing, the coupling parts of the load coupling on the one hand and the On the other hand auxiliary coupling arranged along the longitudinal axis of the coupling in each case at a distance from each other. However, it is also possible for the coupling parts 14a and 16a or 14b and 16b to adjoin one another in the longitudinal direction. Furthermore, it could be arranged overlapping each other. Thus, for example, the pointed free ends 30 of the projections 22 on the coupling part 16a in the open position of the coupling sections adjoin the base of the recess 20, possibly overlap or even overlap it. This is possible due to the different diameters of the load coupling and the auxiliary coupling. The decisive factor is that the alignment of the two coupling sections caused by the auxiliary coupling is completed relative to one another before the mutually engaged coupling parts 14a, 14b of the load coupling prevent further rotational movement of the coupling sections 10a, 10b.

Die Kupplung ist so angeordnet dass der Kupplungsabschnitt 10a dem Anschlussteil, zum Beispiel einem Hubrohr, und der Kupplungsteil 10b dem Abtriebsglied, bzw. der Spindelmutter zugeordnet ist. Die Zuordnung des jeweiligen Kupplungsteils 10a, 10b an der Spindelmutter erfolgt unmittelbar. Diese Zuordnung kann stoffschlüssig erfolgen. Letztgenannte Ausführung kann als bevorzugte Ausführung gesehen. Das Kupplungsteil 10a, 10b ist integraler Bestandteil der Spindelmutter.The coupling is arranged so that the coupling portion 10a is associated with the connecting part, for example a lifting tube, and the coupling part 10b with the driven member, or the spindle nut. The assignment of the respective coupling part 10a, 10b on the spindle nut takes place immediately. This assignment can be cohesive. The latter embodiment can be seen as a preferred embodiment. The coupling part 10a, 10b is an integral part of the spindle nut.

Die Verbindung zwischen Kupplungsabschnitt 10a und dem Hubrohr oder dergleichen kann über ein Außengewinde 40 am Kupplungsteil 10a erfolgen, welches in ein entsprechendes Innengewinde am nicht dargestellten Hubrohr eingreift.The connection between the coupling portion 10a and the lifting tube or the like can take place via an external thread 40 on the coupling part 10a, which engages in a corresponding internal thread on the lifting tube, not shown.

Wenn das Anschlussteil als Hubrohr ausgebildet ist, besteht auch die Möglichkeit, wenigstens einen der diesem zugeordneten Kupplungsabschnitte 10a, 10b einstückig am Hubrohr anzubringen. Als Anschlussteil ist gemäß der vorliegenden Erfindung ein Bauelement definiert, welches dazu geeignet ist, die Bewegung der Spindelmutter auf ein Bauteil eines Möbels unmittelbar oder mittelbar zu übertragen. Eine unmittelbare Übertragung erfolgt, wenn das freie Ende des als Hubrohr ausgebildeten Anschlussteils mit einem Möbelbauteil verbunden ist. Eine mittelbare Übertragung erfolgt unter Zuhilfenahme weiterer Bauteile, welche mit dem freien Ende des Anschlussteils bzw. mit dem freien Ende des Hubrohres verbunden und beispielsweise als Gabelkopf oder dergleichen ausgebildet sind, wobei dieser dann mit dem Möbelbauteil verbunden ist.If the connecting part is designed as a lifting tube, it is also possible to attach at least one of the associated coupling portions 10a, 10b in one piece on the lifting tube. As a connection part, a component is defined according to the present invention, which is adapted to transmit the movement of the spindle nut directly or indirectly to a component of a piece of furniture. An immediate transfer takes place when the free end of the connecting part designed as a lifting tube is connected to a furniture component. An indirect transfer takes place with the aid of further components, which are connected to the free end of the connecting part or with the free end of the lifting tube and formed for example as a clevis or the like, which is then connected to the furniture component.

Die zwischen Spindelmutter und Anschlussteil vorgesehene Kupplung gemäß der Erfindung kann zusätzlich zu einer Kupplung vorgesehen sein, welche zwischen dem vorzugsweise als Hubrohr ausgebildeten Anschlussteil und den verstellbaren Teil eines Möbels oder Patientenlifters angeordnet und beispielsweise in DE 20 2011 000 964 U1 beschrieben ist.The proposed between spindle nut and connector coupling according to the invention may be provided in addition to a coupling which is arranged between the preferably designed as a lifting tube connecting part and the adjustable part of a piece of furniture or patient lifter and, for example in DE 20 2011 000 964 U1 is described.

Diese Kupplung kann auch als Klauenkupplung ausgebildet und manuell betätigbar sein. Die Antriebsseite dieser Klauenkupplung ist dem Anschlussteil bzw. mit dem Hubrohr fest verbunden, wobei deren Abtriebsseite mit dem Möbelbauteil verbunden ist. In der Normalbetriebstellung überträgt diese manuell betätigbare Klauenkupplung Kräfte sowohl in Längsrichtung, also in Richtung der linearen Verstellbewegung der Spindelmutter, als auch in deren Umfangsrichtung. In ausgekuppelten und damit in betätigtem Zustand überträgt die manuell betätigbare Klauenkupplung keine Kräfte in Umfangsrichtung. Es besteht jedoch die Möglichkeit, durch vorzugsweise manuellen Angriff an einem der Kupplungsteile oder am Hubrohr dieses in die jeweilige neue Betriebsstellung zu verdrehen. Wenn das Hubrohr, das Kupplungsteil 10a, das Kupplungsteil 10b und die Spindelmutter in drehfester Verbindung miteinander stehen, kann die Spindelmutter manuell in Längsrichtung der Spindel verfahren werden, so dass in einer Notsituation eine in beispielsweise gegen die Schwerkraft erstellte Last durch manuelles Drehen am Anschlussteil bzw. Hubrohr abgesenkt werden kann.This coupling can also be designed as a dog clutch and be manually operated. The drive side of this dog clutch is firmly connected to the connecting part or with the lifting tube, wherein the output side is connected to the furniture component. In the normal operating position, this manually operable jaw clutch transmits forces both in the longitudinal direction, ie in the direction of the linear adjustment movement of the spindle nut, as well as in the circumferential direction. In disengaged and thus actuated state, the manually operable jaw clutch transmits no forces Circumferential direction. However, it is possible to twist by preferably manual attack on one of the coupling parts or on the lifting tube this in the respective new operating position. When the lifting tube, the coupling part 10a, the coupling part 10b and the spindle nut are in rotationally fixed connection to each other, the spindle nut can be moved manually in the longitudinal direction of the spindle, so that in an emergency situation, for example, a load created in, for example, against gravity by manually turning the connection part or Lifting tube can be lowered.

Die beiden Kupplungsteile 10a und 10b der zwischen Spindelmutter und Hubrohr befindlichen Kupplung kommen dann außer Eingriff, wenn zum Beispiel der Tragarm oder Ausleger eines Patientenlifters - im Allgemeinen versehentlichirgendwo aufliegt und somit die durch den Linearantrieb zu bewirkende Bewegung unterbrochen wird. Da Schließen der Kupplung, also das Wiedereinkuppeln der Kupplungsteile, erfolgt, selbsttätig, sobald wieder normale Betriebsbedingungen vorhanden sind.The two coupling parts 10a and 10b of the coupling located between the spindle nut and the lifting tube are then disengaged, for example, when the support arm or extension arm of a patient lifter is generally inadvertently lying anywhere, thus interrupting the movement to be effected by the linear drive. Since closing the clutch, so the re-engagement of the coupling parts, takes place, automatically, as soon as normal operating conditions are available.

BezugzeichenlisteLIST OF REFERENCE NUMBERS

10a, b10a, b
Kupplungsabschnittcoupling section
14a, b14a, b
Kupplungsteilcoupling part
16a, b16a, b
Kupplungsteilcoupling part
1818
Vorsprung an 14a, bProjection at 14a, b
2020
Ausnehmungen 14a, bRecesses 14a, b
2222
Vorsprung an 16aProjection at 16a
2424
Vorsprung an 16bProjection at 16b
2626
Ausnehmung an 16aRecess at 16a
2828
Ausnehmung an 16bRecess at 16b
3030
freies Ende von 22free end of 22
3232
Schrägflächesloping surface
3434
Randabschnittedge section
3636
Bauteil von 10aComponent of 10a
3838
Bauteil von 10bComponent of 10b
4040
Außengewindeexternal thread

Claims (8)

  1. An electric motor linear drive for use on articles of furniture and patient lifters, which is provided with a drive unit, the drive output member of which is in the form of a linearly displaceable spindle nut which is operatively connected to a connection part for connection to an adjustable part of an article of furniture or a patient lifter, wherein the spindle nut is connectable to the connection part by way of a releasable, torque-carrying load coupling, wherein the load coupling (14a, 14b) is in the form of a dog clutch and there are provided two coupling portions (10a, 10b), characterised in that the first of the coupling portions (10a, 10b) is an integral component of the spindle nut and the second of the coupling portions (10a, 10b) is connected to the connection part, and there is further provided an auxiliary coupling (16a, 16b), the first coupling part (16a, 16b) of which is mounted to the first coupling portion (10a, 10b) and the second coupling part of which is mounted to the second coupling portion, and the coupling parts of the load coupling (14a, 14b) and the auxiliary coupling (16a, 16b) are positioned relative to each other in the closing direction in such a way that in the course of the closing movement of the two coupling portions the two coupling parts of the auxiliary coupling come into engagement with each other before the two coupling parts (14a, 14b) of the load coupling come into engagement with each other and the cooperating recesses (26) and projections (28) of both coupling parts (16a, 16b) of the auxiliary coupling are so designed and arranged so that in the course of the relative closing movement of the coupling portions (10a, 10b) the coupling parts (14a, 14b) of the load coupling experience orientation in the circumferential direction for the final closed position.
  2. A linear drive according to claim 1 characterised in that at least one of the surfaces that come into contact with each other of the two coupling parts (16a, 16b) extends inclinedly relative to the closing direction of the coupling portions (10a, 10b) in such a way that in the course of the closing movement a torque is produced in order to orient the coupling parts (14a, 14b) of the load coupling relative to each other in the circumferential direction.
  3. A linear drive according to one of the preceding claims characterised in that the diameter of the circular coupling parts (16a, 16b) of the auxiliary coupling is smaller than the diameter of the coupling parts of the load coupling (14a, 14b).
  4. A linear drive according to one of the preceding claims characterised in that the coupling portions (16a, 16b) of the auxiliary coupling are of such a form that in the closed position of the two coupling portions (10a, 10b) a limited relative rotational movement of the two coupling portions is possible.
  5. A linear drive according to one of the preceding claims characterised in that the projections (22) of at least one of the coupling parts (16a) of the auxiliary coupling taper to a point at their free ends (30).
  6. A linear drive according to one of the preceding claims characterised in that a coupling part (16a) of the auxiliary coupling is arranged within one of the two coupling portions (10a, 10b).
  7. A linear drive according to one of the preceding claims characterised in that the coupling part (16b) of the auxiliary coupling of the other coupling portion (10b) is mounted to an extension of the coupling portion which protrudes with respect to the coupling part (14b) of the load coupling in the longitudinal direction thereof.
  8. A linear drive according to one of the preceding claims characterised in that the connection part is in the form of a lift tube and at least one of the coupling portions (10a, 10b) associated therewith is at least partially integrally mounted on the lift tube.
EP14194079.1A 2013-11-20 2014-11-20 Electromotive linear drive Active EP2891826B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201320105249 DE202013105249U1 (en) 2013-11-20 2013-11-20 Electromotive linear drive

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EP2891826A2 EP2891826A2 (en) 2015-07-08
EP2891826A3 EP2891826A3 (en) 2016-07-27
EP2891826B1 true EP2891826B1 (en) 2019-03-27

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EP (1) EP2891826B1 (en)
DE (1) DE202013105249U1 (en)
DK (1) DK2891826T3 (en)
ES (1) ES2732872T3 (en)

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SE539553C2 (en) * 2015-09-01 2017-10-10 Nobia Ab Safety clutch connected to a pull down unit for a cabinet
JP6836370B2 (en) * 2016-11-07 2021-03-03 ポップリベット・ファスナー株式会社 Blind rivet fastening device
DE202019103390U1 (en) * 2019-06-17 2020-09-18 Dewertokin Gmbh Linear drive with position alignment means between guide tube and spindle nut
CN114569359B (en) * 2022-03-01 2023-09-05 上海联影医疗科技股份有限公司 Liftable supporting device
DE102022209300B3 (en) * 2022-09-07 2023-08-03 Magna Pt B.V. & Co. Kg Jaw clutch with overrunning function and drive arrangement

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AT281510B (en) * 1968-04-10 1970-05-25 Gelenkwellenbau Gmbh Quick-release tooth coupling
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ES2732872T3 (en) 2019-11-26
EP2891826A2 (en) 2015-07-08
DE202013105249U1 (en) 2015-02-27
EP2891826A3 (en) 2016-07-27
DK2891826T3 (en) 2019-07-08

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